A new diesel oxygenate additive and its effects on engine combustion and emissions

Tosun

et al. 2017

mijst

Section: Introductionmentioning

confidence: 99%

EFFECT OF MgO NANOPARTICULE ADDITIVES ON PERFORMANCE AND EXHAUST EMMISSIONS OF DIESEL FUELLED COMPRESSION IGNITION ENGINE

Tosun

et al. 2017

mijst

Section: Introductionmentioning

confidence: 99%

“…The most convenient method for research is adding raw oxygen to intake for certain percentage by volume. Oxygenation methods also improves the emission and performance for biodiesels and diesel blends [6] [10] [19] .For a fixed volume of combustion chamber and rated speed, a certain amount of oxygen can be added for optimum values of emission because the limitation of maximum pressure and temperature, that can be further controllable by the help of different compression ratios. Thus the purpose of the study to investigate the effect of oxygen enriched combustion at different compression ratio on a single cylinder four stroke naturally aspirated diesel engine with different level of oxygen concentration and compression ratios.…”

mentioning

confidence: 99%

Effects of Additional Oxygen Supply in Single Cylinder Diesel Fuel Using Variable Compression Ratio Engine

Yadav¹,

Gupta²,

Gupta³

2017

IJET

-In the present study, a variable compression single cylinder diesel engine was used to study the effects of oxygen enrichment on the performance of engine at different compression ratios (C.R.) from 16.5 to 19.5 at different loads and compared to the amount of additional oxygen in four different rates from 1L/min to 4L/min. Oxygen cylinders were connected to intake manifold with throttle valve to supply additional oxygen. Enrichment of oxygen favours combustion in many performance parameters so the tests were carried out for the brake power (B.P.), Mean effective pressure, (P mef ), specific fuel consumption (S.F.C.), Mechanical efficiency (η mecheff ) and exhaust gas temperature (E.G.T.). The purpose of this study is to deal with the major technological characteristic of enriched oxygen used in variable compression ratio single cylinder diesel engine for best possible values of secure engine limits. The test results show that the combustion performances were enhanced as there was increase in B.P., P mef and decrease in S.F.C. and increase in rate of oxygen in intake air increases the charge burning rates and flame combustibility resulting higher exhaust gas temperature. Overall mechanical efficiency in lower compression ratio was high but for higher compression ratios there was a drop in mechanical efficiency. Keywords -Oxygen Enrichment, Variable Compression Ratio, Brake Power, Specific Fuel Consumption, Exhaust Gas Temperature.I. INTRODUCTION In diesel engine combustion, ratio of fuel varies according to load requirements, so principle of using air in diesel engines says that excess air improves mixing rates but at the time of exhaust, it also carry heat at higher rates which affect the thermal efficiency of each cycle. In the mixture of fuel and air in small diesel engines mixing rates depend on many designs and operating variables and those variables will affect the performance of any engine. According to research under the subject of oxygen enrichment, it results that a certain level of oxygenation can improve the mixing rates to increase the performance and reduce the certain amount of emissions [1] [5] .The investigation and research in this field are very vast and conclusive in many respects. All results show a considerable increase in oxides of nitrogen and decrease in smoke, carbon monoxides and unburned hydrocarbons as the ratio of oxygen increases. Reduction in engine noise due to elevated oxygen level in induced air is also concluded by researchers [4] . Higher oxygen concentrations increase the mixtures' burning rate at the same compression ratio and low quality fuel can also be used in engines without much affecting the performance. The main drawback of oxygen enrichment is higher level of oxides of nitrogen in exhaust due to increased maximum pressure in combustion chamber. The efforts of many researchers conclude a range of percentage of maximum concentration of oxygen in intake is 30% by volume in which both particulate matters and oxides of nitrogen can be reduced for a fixed geome...

“…Because these oxygenated fuels can be blended directly to with diesel and can be used in prime movers. The oxygenated fuels reduce the soot since the oxygen atoms in its structure [2][3][4] . The oxygen availability in the fuel gives smokeless combustion in diesel engines 5 .…”

Section: Introductionmentioning

confidence: 99%

Chemical and Experimental Analysis of Fumigation Process to Reduce Emission without Affecting the Performance of an Engine

2017

Rasayan J Chem

Diesel engines have been widely used for better efficiency and low emissions, but diesel engine produces more smoke, particulate matter and oxides of nitrogen and reducing all these emissions simultaneously is not possible as on today due to trade of between oxides of nitrogen and smoke. Engines emission can be decreased by employing fumigation. Using fumigation process emission composition can be reduced when compared to normal operation. In this work an attempt has been made to reduce oxides of nitrogen, hydrocarbon and carbon monoxide using methanol fuel in the combustion chamber. The chemical behaviors and reactions of methanol over hydrocarbons also analyzed. A single cylinder four stroke, 5hp, direct injection, engine test rig was used for experiment purpose. From the experimental analysis, it was found that alcoholic fuels can effectively be used in diesel engines with methanol fumigation using EFI kit that normally operates at high power outputs. The result shows that brake thermal efficiency is slightly decreased when compared without modification at all flow rates.